update readme

.github/workflows/build.yml

@@ -35,10 +35,3 @@ jobs:
         run: make coverage
       - name: Run codecov
         uses: codecov/codecov-action@v3
-
-  format:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
-    - uses: psf/black@stable

README.md

@@ -1231,7 +1231,11 @@ The tests are all written with pytest. You run them with:
 make test
 ```
 
-We use [Black](https://black.readthedocs.io/en/stable/index.html) for code formatting, with our config in the `pyproject.toml` file.
+We use [Black](https://black.readthedocs.io/en/stable/index.html) for code formatting, with our config in the `pyproject.toml` file. To ensure a PR follows the right format, you can set up and use our pre-commit settings with
+
+```bash
+pre-commit install
+```
 
 ## License